近十年来,北欧国家抚育间伐一直以使用集运机的短材作业方式为基础。抚育间伐要求每公顷保留立木1000—2000棵,这样,采用普通的林业拖拉机在林内穿行作业,势必会对树干和树木根系造成很大损伤,而降低树木的生长量。况且,集材道间距30米,道宽4—4.9米,林道网这样密,林道又这样宽,必然造成林业生产的损失和林木生长面积的减少。其次,采用短材方式(伐区采、打、造后由人工将木材归到集材道边)对林业工人来说劳动强度太大。因此,近年来北欧各国一直致力于新型机械和新的采集方式 For the past decade, the thinning of the Scandinavian countries has been based on the use of short-haul aircraft for the new aircraft. Tending thinning requires the reservation of 1,000-2,000 standing trees per hectare so that the use of ordinary forestry tractors in the forest will inevitably cause great damage to the trunk and tree roots and reduce the growth of trees. Moreover, the timber road spacing 30 meters, road width 4-4.9 meters, Lindau network is so dense, forest Road and so wide, will inevitably result in loss of forestry production and forest growth area. Second, using the short material method (cutting, hitting and cutting wood to the timber road after artificial cutting) is too labor intensive for forestry workers. Therefore, in recent years, Nordic countries have been devoting themselves to new types of machinery and new acquisition methods